What transmission? - LS1TECH - Camaro and Firebird Forum Discussion

Automatic Transmission 4L60E | 4L80E | TH350 | TH400 | TH2004R | Powerglide | Converters | Shift Kits
Sponsored by:
Sponsored by:

What transmission?

Thread Tools Search this Thread
Old 10-19-2006, 07:24 PM   #1
On The Tree
Thread Starter
Join Date: Jan 2006
Posts: 117
Default What transmission?

I have just bought a 345HP high compression LQ9 truck engine to put in my '70 Impala and now I need an auto trans. The engine comes from an 04 Silverado with a 4L65E. I want to get a 4L80E, so ,which one will fit? Are they all the same, same ratios, same converters...? Will any 4L80E bolt on to my engine? Someone told me that a 4L80e has its own computer and harness, I had always thought the trans was running off the same computer as the engine??? Anything else I need to know?
wave1957 is offline   Reply With Quote
Old 10-19-2006, 10:37 PM   #2
On The Tree
Join Date: Mar 2005
Location: so cal
Posts: 103

no they are way different, differnt size (the 4l80e is longer and larger diameter), diff ratio's(2.48, 1.48, 1, .7 ish i dont remmber o/d, the 60e is 3.06, 1.54, 1, .67) the converter is also way different, but it will still bolt up if you get a 80e (chevy has had the same basic pattern since 1965 especially if you get a late model core,it has the top hole you need so you can run all 6 bolts). however, the LQ4 (same displacement different heads) came with the 4l80e in the 3/4 ton non HD trucks so my suggestion, find a comp out of a truck with that combo, or have the computer you own reflashed to think it is a 3/4 ton pickup with that combo. (yes it can be done even if the dealer tells you he can't its just you will need the vin off a truck with that combo......just look for one on the lot for one) the only trannies that have their own computers will be the 6L80e, not 4L80e (that computer is actually in the trans)
back4more is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 04:06 PM.

  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: